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Linux Kernel URB and IPv6 Flowlabel Handling Denial of Service

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Release Date:  2005-09-27    Last Update:  2006-03-31    Views:  15,115

Secunia Advisory SA16969

Where:

From local network

Impact:

DoS

Solution Status:

Partial Fix

Operating System:

CVE Reference(s):

Description


Two vulnerabilities, a security issue, and a weakness have been reported in the Linux Kernel, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and by malicious people to cause a DoS.

1) An error in handling asynchronous USB access via usbdevio can be exploited to crash the kernel via a process that issues an URB (USB Request Block) from userspace and terminates before the URB returns.

Successful exploitation requires that the user has permissions to access an USB device.

2) An error in jiffies comparison in the "ipt_recent.c" netfilter module, when its value is greater than LONG_MAX, may cause ipt_recent netfilter rules to block too early.

3) An error in the IPv6 flowlabel handling code in "/net/ipv6/ip6_flowlabel.c" can be exploited by a local users to cause the kernel to free non-allocated memory. This corrupts kernel memory and can cause the system to crash.

4) The ICMP implementation responds to broadcast ECHO/TIMESTAMP requests by default. This can potentially be exploited to cause a DoS via a smurf attack.


Solution:
Vulnerability #1, #3 and #4 have been fixed in version 2.6.14.

Further details available to Secunia VIM customers

Provided and/or discovered by:
1) Harald Welte
2) Juergen Kreileder
4) Tomasz Chomiuk

Original Advisory:
http://marc.theaimsgroup.com/?l=linux-kernel&m=112766129313883
http://blog.blackdown.de/2005/05/09/fixing-the-ipt_recent-netfilter-module/

Kernel.org:
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.14
http://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git;a=commit;h=46113830a18847cff8da73005e57bc49c2f95a56
http://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git;a=commit;h=4ea6a8046bb49d43c950898f0cb4e1994ef6c89d
http://www.kernel.org/git/?p=linux/kernel/git/gregkh/linux-2.6.14.y.git;a=commit;h=7ce312467edc270fcbd8a699efabb37ce1802b98

Red Hat Bugzilla:
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=174081

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Linux Kernel URB and IPv6 Flowlabel Handling Denial of Service

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